This is a note to let you know that I've just added the patch titled
s390/vtime: fix increased steal time accounting
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-vtime-fix-increased-steal-time-accounting.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d54cb7d54877d529bc1e0e1f47a3dd082f73add3 Mon Sep 17 00:00:00 2001
From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Date: Wed, 10 Mar 2021 14:23:37 +0100
Subject: s390/vtime: fix increased steal time accounting
From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
commit d54cb7d54877d529bc1e0e1f47a3dd082f73add3 upstream.
Commit 152e9b8676c6e ("s390/vtime: steal time exponential moving average")
inadvertently changed the input value for account_steal_time() from
"cputime_to_nsecs(steal)" to just "steal", resulting in broken increased
steal time accounting.
Fix this by changing it back to "cputime_to_nsecs(steal)".
Fixes: 152e9b8676c6e ("s390/vtime: steal time exponential moving average")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.1
Reported-by: Sabine Forkel <sabine.forkel@xxxxxxxxxx>
Reviewed-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/vtime.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -217,7 +217,7 @@ void vtime_flush(struct task_struct *tsk
avg_steal = S390_lowcore.avg_steal_timer / 2;
if ((s64) steal > 0) {
S390_lowcore.steal_timer = 0;
- account_steal_time(steal);
+ account_steal_time(cputime_to_nsecs(steal));
avg_steal += steal;
}
S390_lowcore.avg_steal_timer = avg_steal;
Patches currently in stable-queue which might be from gerald.schaefer@xxxxxxxxxxxxx are
queue-5.10/s390-vtime-fix-increased-steal-time-accounting.patch
